iphone - 如何按升序比较包含日期的 NSString 数组

Question

我有一个数组，其中包含以字符串表示的日期列表:

 NSMutableArray *objArray=[[NSMutableArray alloc]init];

 [objArray addObject:@"18-01-2013 2:51"];
 [objArray addObject:@"16-01-2013 5:31"];
 [objArray addObject:@"15-01-2013 3:51"];
 [objArray addObject:@"17-01-2013 4:41"];
 [objArray addObject:@"03-02-2013 3:21"];
 [objArray addObject:@"05-01-2013 3:01"];

请告诉我如何使用日期按升序排列这个数组。

Answer 1

NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease]; [格式化程序 setDateFormat:@"dd-MM-yyyy hh:mm"];

    NSComparator compareDates = ^(id string1, id string2)
    {
        NSDate *date1 = [formatter dateFromString:string1];
        NSDate *date2 = [formatter dateFromString:string2];

        return [date1 compare:date2];
    };

    NSSortDescriptor * sortDesc = [[[NSSortDescriptor alloc] initWithKey:@"self" ascending:NO comparator:compareDates]autorelease];

    [objArray sortUsingDescriptors:[NSArray arrayWithObject:sortDesc]];

通过使用这段代码我得到了准确的输出，谢谢大家